How to modify \part style in memoir

Question

A beginner question: I would like to print \part with roman numbers as it follows:

I. Teil

or

I. rész

Someone could please explain me how to do it?

Answer 1

The localisation is done by using the appropriate language with the babel package. Memoir has no hooks for modification of the \part code, so you need to do it by redefining it in your preamble:

\documentclass{memoir}
\usepackage[ngerman]{babel}
\makeatletter
\long\def\@part[#1]#2{%
  \M@gettitle{#1}%
  \phantomsection
  \ifnum \c@secnumdepth >-2\relax
    \refstepcounter{part}%
    \addcontentsline{toc}{part}%
      {\protect\partnumberline{\thepart}#1}%
    \mempartinfo{\thepart}{#1}{#2}%
  \else
    \addcontentsline{toc}{part}{#1}%
    \mempartinfo{}{#1}{#2}%
  \fi
  \partmark{#1}%
  {\centering
   \interlinepenalty \@M
   \parskip\z@
   \normalfont
   \ifnum \c@secnumdepth >-2\relax
    \printpartnum.\ \printpartname \partnamenum % changed order and added . here
     \midpartskip
   \fi
   \printparttitle{#2}\par}%
  \@endpart}
\makeatother
\begin{document}
\part{A part title}
\end{document}